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Published Mar 17, 21
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This post is stimulated by a conversation with a trainee yesterday. He suggested that we utilize rivets instead of # 10-32 fasteners to attach a critical piece of structure. My very first reaction was unfavorable, but I discovered myself not able to articulate a genuinely good explanation why we ought to use fasteners over rivets. Automotive Fasteners.

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Would anyone be prepared to share their engineering based opinions about the pros and cons of utilizing rivets vs threaded fasteners in FIRST robots? Exist certain applications where your group chooses one type over another? Do you have particular design guidelines, tools, specific rivet part numbers, and so on which you utilize effectively? Would you, for example, use rivets to connect a plate gear to a versahub? Why or why not? We've utilized rivets sporadically in the past, however it constantly seems that by the end of competitors season, lots of, if not all of them have actually been drilled out and changed with threaded fasteners.

Here are my observations based upon previous experience. Please fix my mistaken beliefs if your experience states I'm wrong: If parts require to be eliminated for servicing the robot, you need to use threaded fasteners. Rivets must be utilized for setups which are expected to be long-term. Rivets are best in shear applications.

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Rivets of comparable strength to threaded fasteners (stress and shear) don't offer substantial weight savings. Corollary: Changing a threaded fastener with a lighter rivet results in decreased strength in that joint. (The exception may be if use of a rivet leads to the removal of a nut) Rivets are most beneficial and have the most potential for weight savings when signing up with very thin products (ex 1/16" thick aluminum) which can't be tapped.

Anybody care to share their experiences? I'm expecting more comprehensive responses than "We use rivets. They work great for us." How do you utilize them? What do you do to make them work for you? I like to utilize them in structural applications. Concept being a general weight cost savings over a number of mostly irreversible joints.

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I agree 100% with threaded fasteners for moving parts and modular mechanism interfaces ToddF: Here are my observations based upon past experience. Please fix my misconceptions if your experience says I'm incorrect: If parts need to be gotten rid of for servicing the robot, you ought to use threaded fasteners. Rivets ought to be used for setups which are expected to be irreversible.

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If you know you require to remove a part to service it (or another part) then utilize threaded fasteners. ToddF: Rivets are best in shear applications. If utilized in stress applications, they tend to loosen up in time, and aren't easily re-tightened except by drilling out and replacing the rivet.

Screws in stress have tension risers at the threads which can cause the thread to fail. Threaded fasteners tend to loosen up due to vibration. Rivets tend to loosen up since they are improperly sized (reach is incorrect or hole size is incorrect). Rivets just loosen up in tension if there is a shock load on them.

If you anticipate heavy shock loads, use threaded fasteners (with Loctite). ToddF: Rivets of comparable strength to threaded fasteners (stress and shear) don't offer significant weight cost savings. Corollary: Changing a threaded fastener with a lighter rivet results in decreased strength because joint. (The exception may be if usage of a rivet leads to the elimination of a nut) Most threaded fasteners are hardened steel.

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For the exact same strength the rivet will normally weigh 2/3 the weight of screws. ToddF: Rivets are most useful and have the most possible for weight cost savings when signing up with really thin materials (ex 1/16" thick aluminum) which can't be tapped. Rivets tend to be beneficial on thin material for that factor as long as the reach of the rivet is appropriate, nevertheless, rivets also save weight when the strength of steel screws are not required and nuts can be gotten rid of.

The very same holds true for screws. Soft product needs to constantly have washers to spread out the load of the fastener (no matter type). Hope that assists. So as a general basis on my group, rivet if it is non-essential, and bolt it if it is necessary. If the part your protecting will see a great deal of wear and tear throughout the season, bolt it.

There are some applications where we require to utilize bolts, simply due to the fact that we can't fit a rivet gun head where we want it - 3v Fasteners. And if you do use bolts, keep in mind to either use locknuts, or locktite on regular threaded nuts. We also bolt parts that require zero, or near no, lossesning throughout the season, because if the hole is not best for the rivet, the rivet will lossen, where ever the force.

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